Super Junior Hands trademark...

Annyeong.... recently i noticed something in super junior SEXY, FREE & SINGLE MV. From what i saw there has some hands trademark in 3 Super junior MV liked Sorry-sorry, Mr. Simple then A-Cha and the new mv Sexy free & single. Let's see what their hands trademark... 1. Sorry sorry: Washing their hands 2. Mr. Simple: Drying their hands 3. A-Cha: Bragging about how clean their hands were 4. Sexy free & single : ???

What SFS hands trademark should be??? ^^ But i still loved this new mv's... They so hot!!!!